In Linux, which file system type is commonly used for USB drives?

FAT32 is the commonly used file system type for USB drives due to its widespread compatibility across various operating systems, including Linux, Windows, and macOS. This compatibility makes it an ideal choice for USB drives that are often used to transfer files between different environments.

FAT32 supports smaller file sizes, with a maximum of 4GB per file, which is generally sufficient for typical file transfer needs. Its simpler structure also allows for effective use on devices with limited storage, such as USB flash drives.

Other file systems like ext4, XFS, and Btrfs are usually employed for more complex storage solutions, particularly in Linux environments. They provide advanced features suited for hard drives or partitions but may not offer the same cross-platform compatibility or simplicity as FAT32 when used with USB drives.